i downloaded the demo and i get poor performance. i have core 2 duo 2.96ghz, 2gb ddr2 ram, geforce 8800gs 384mb. i should get over 30fps at 1680*1200 resolution. but i get under 30fps at 1280*1200 res at ultra settings. i dont know why. is it because of the demo or if i get the full game and the patch the performance will be better???